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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6fce19e5fab77bcef5ebbbab467b7bd9c455a2d0c0675390ef5d471b7fee1d' 
  AND token = 'VFXIc8ncO7htFIrMtr7d2yokBeSDiIpgzIzJ0ERBNR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}